WASHINGTON â€” Although Al Qaeda has been weakened in the past year and a half, the terror network still poses the greatest terror threat to America and will do anything it can to "inflict significant casualties" on the United States, U.S. intelligence chiefs told the Senate Select Committee on Intelligence Tuesday.

"Al Qaeda is still dedicated to striking the United States homeland," CIA Director George Tenet said in his remarks. "We place no limitations on our expectations on what Al Qaeda might do to survive."

"The Al Qaeda terrorist network is clearly the most urgent threat to U.S. interests," said FBI Director Robert Mueller. "The organization maintains the ability and the intent to inflict significant casualties in the United States with little warning.